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Consolidated Statements of Cash Flows - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES |  |
Net loss | $ (3,517,065) | $ (12,814,324)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation | 923,304 | 2,003,695
Amortization of patents and website | 71,177 | 66,017
Realized (gain) loss on sale of digital currencies | (36,092) | 152,485
Change in fair value of warrant liability | (26,234) | (1,699,522)
Change in fair value of mining payable | (507,862) |
Impairment of mining equipment |  | 2,222,688
Impairment of leasehold improvements | 447,776 |
Stock based compensation | 933,682 | 1,425,683
Amortization of debt discount |  | 2,290,028
Amortization of right-of-use assets | 82,840 |
Bad debt allowance |  | 6,826
Break-up fee - issuance of shares to GBV |  | 2,850,000
Changes in operating assets and liabilities: |  |
Digital currencies | (1,185,227) | (1,495,402)
Lease liability | (72,548) |
Litigation liability |  | (2,150,000)
Prepaid expenses and other assets | (435,159) | (371,151)
Accounts payable and accrued expenses | 2,753 | (725,594)
Net cash used in operating activities | (3,318,655) | (8,238,571)
CASH FLOWS FROM INVESTING ACTIVITIES |  |
Sale of digital currencies | 1,220,178 | 1,342,917
Acquisition of patents |  | (250,000)
Purchase of property and equipment | (5,225) | (5,251,719)
Net cash provided by (used in) investing activities | 1,214,953 | (4,158,802)
CASH FLOWS FROM FINANCING ACTIVITIES |  |
Proceeds from issuance of common stock/At-the-market offering | 255,893 |
Offering costs for the issuance of common stock/At-the-market offering | (10,399) |
Net cash provided by financing activities | 245,494 |
Effect of foreign exchange rate changes |  | 15
Net decrease in cash and cash equivalents | (1,858,208) | (12,397,358)
Cash and cash equivalents - beginning of period | 2,551,171 | 14,948,529
Cash and cash equivalents - end of period | 692,963 | 2,551,171
SUPPLEMENTAL CASH FLOW INFORMATION |  |
Cash paid for interest expense |  |
Cash paid during the year for income taxes |  |
Supplemental schedule of non-cash investing and financing activities: |  |
Par value adjustment due to reverse split | 1 |
Conversion of Series E Preferred Stock to common stock |  | 551
Common stock issued for acquisition of patents |  | 960,000
Common stock issued for purchase of assets | 3,064,687 |
Common stock issued for note conversion |  | 3,055,588
Restricted stock issuance | 15 | 44
Mining servers payable | 1,021,562 |
Warrants exercised into common shares |  | $ 55,791

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